615551649990 has 32 divisors (see below), whose sum is σ = 1477406393856. Its totient is φ = 164137947360.

The previous prime is 615551649941. The next prime is 615551650001. The reversal of 615551649990 is 99946155516.

615551649990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×615551649990³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17022 + ... + 1109681.

It is an arithmetic number, because the mean of its divisors is an integer number (46168949808).

Almost surely, 2^615551649990 is an apocalyptic number.

615551649990 is an abundant number, since it is smaller than the sum of its proper divisors (861854743866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

615551649990 is a wasteful number, since it uses less digits than its factorization.

615551649990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144924.

The product of its (nonzero) digits is 13122000, while the sum is 60.

The spelling of 615551649990 in words is "six hundred fifteen billion, five hundred fifty-one million, six hundred forty-nine thousand, nine hundred ninety".